CAREER: Markey served in the Massachusetts House of Representatives from 1973 to 1977. He entered Congress in 1977, where he represents the state's 5th Congressional District. He is the ranking Democratic member of the Natural Resources Committee, which he has served on since first winning a seat in Congress. From 2007 to 2010, Markey served as chairman of the Select Committee on Energy Independence and Global Warming. During the 111th Congress from 2009 to 2011, Markey served as chairman of the Energy and Environment Subcommittee. For 20 years, Markey also served as chairman or ranking Democratic member of the Subcommittee on Telecommunications and the Internet. From 2003 to 2009, Markey served as a senior member of the House Homeland Security Committee.

FAMILY: Lives in Malden with his wife, Susan Blumenthal.

QUOTE: "I went to Congress aided by the values of my hometown of Malden and worked every day fighting those fights that the people of Malden and across Massachusetts would fight if they were there."

Lawyers for Boston Marathon bomber Dzkokhar Tsarnaev rested their case in his federal death penalty trial Tuesday after presenting a brief case aimed at showing his late older brother was the mastermind of the 2013 terror attack.